Method for manufacturing LCD panel

Patent metadata

Field	Value
Publication number	US-10627656-B2
Application number	US-201815775854-A
Country	US
Kind code	B2
Filing date	Mar 26, 2018
Priority date	Mar 5, 2015
Publication date	Apr 21, 2020
Grant date	Apr 21, 2020

Abstract

The present disclosure provides a method for manufacturing a liquid crystal display (LCD) panel, including cleaning the first substrate by a hydrophobic surface cleaning material and cleaning the second substrate by a hydrophilic surface cleaning material; heating the first substrate and the second substrate at a high temperature; bonding the first substrate with the second substrate to from a liquid crystal cell; and irradiating the liquid crystal cell with UV light to form a first thin film on the surface of the first substrate and to form a second thin film on the surface of the second substrate.

First claim

What is claimed is:

1. A method for manufacturing a liquid crystal display (LCD) panel, comprising:
a step S 10 of providing a first substrate and a second substrate;
a step S 20 of cleaning the first substrate by a hydrophobic surface cleaning material and cleaning the second substrate by a hydrophilic surface cleaning material;
a step S 30 of heating the first substrate and the second substrate at a high temperature of 100-150° C. for 1-10 minutes;
a step S 40 of dropping a self-alignment liquid crystal material onto a surface of the first substrate, coating a sealant on a surface of the second substrate and curing the sealant, and bonding the first substrate with the second substrate to from a liquid crystal cell; and
a step S 50 of irradiating the liquid crystal cell with UV light to form a first thin film on the surface of the first substrate and to form a second thin film on the surface of the second substrate, wherein a thickness of the first thin film is less than a thickness of the second thin film.

2. The method for manufacturing the LCD panel according to claim 1 , wherein the self-alignment liquid crystal material includes a vertical alignment agent, a polymerizable monomer, and a negative liquid crystal material.

3. The method for manufacturing the LCD panel according to claim 2 , wherein an amount of the vertical alignment agent is 0.1-5 wt % based on a total mass of the self-alignment liquid crystal material, an amount of the polymerizable monomer is 0.1-1 wt % based on the total mass of the self-alignment liquid crystal material, and an amount of the negative liquid crystal material is 94-99.8 wt % based on the total mass of the self-alignment liquid crystal material.

4. The method for manufacturing the LCD panel according to claim 3 , wherein the vertical alignment agent has a formula of:

wherein Q is an amine group, —OH, —COOH, or —SH;
A is a benzene group or a cycloalkyl group;
Sp is —(CH 2 )n- and n is a number of 1-8, wherein CH 2 can be replaced with —O—, —S—, —CO—, —CO—O—, —O—CO—, —O—CO—O—, —OCH 2 —, —CH 2 O—, —CH═CH—, —CF═CF—, —CH═CH—COO—, —OCO—CH═CH—, or —C≡C—;
R is a straight or branched chain C 3 -C 20 alkyl group, wherein CH 2 can be replaced with —O—, —CONH—, —COO—, —O—CO—, —CO—, or —CH═CH—, and H can be replaced with F or Cl;
P is a polymerizable group selected from at least one of a methyl methacrylate group, a methacrylate group, a vinyl group, a vinyloxy group, and an epoxy group; n is a number of the polymerizable groups which connect to a same aromatic ring and n is an integer of 1-3; and if n is greater than 1, the polymerizable groups can be same or different; and
X is a substituted group selected from at least one of —F, —Cl, —Br, a methyl group, —CN, and a straight or branched chain C 2 -C 8 alkyl group, wherein one or more methyl groups of the alkyl group which are not adjacent to each other can be replaced with O or S; m is a number of the substituted groups which connect to the same aromatic ring and m is an integer of 1-3; if m is greater than 1, the polymerizable groups can be same or different; and n+m is less than a number of groups to which the aromatic ring at most connect.

5. The method for manufacturing the LCD panel according to claim 4 , wherein in the step of S 50 , an irradiation energy of the UV light is 85-100 MW/cm 2 , and an irradiation duration of the UV light is 20-100 minutes.

6. The method for manufacturing the LCD panel according to claim 1 , wherein the first substrate is an array substrate, and the second substrate is a color filter substrate.

7. The method for manufacturing the LCD panel according to claim 1 , wherein the first substrate is a color filter substrate, and the second substrate is an array substrate.

8. The method for manufacturing the LCD panel according to claim 1 , wherein the hydrophobic surface cleaning material is a mixed solution including fatty acid glyceride and acetone, and a mass ratio of fatty acid glyceride to acetone is 3:997.

9. The method for manufacturing the LCD panel according to claim 1 , wherein the hydrophilic surface cleaning material is a mixed solution including propanetrione and water, and a mass ratio of propanetrione to water is 3:997.

10. A method for manufacturing a liquid crystal display (LCD) panel, comprising:
a step S 10 of providing a first substrate and a second substrate;
a step S 20 of cleaning the first substrate by a hydrophobic surface cleaning material and cleaning the second substrate by a hydrophilic surface cleaning material;
a step S 30 of heating the first substrate and the second substrate at a high temperature;
a step S 40 of dropping a self-alignment liquid crystal material onto a surface of the first substrate, coating a sealant on a surface of the second substrate and curing the sealant, and bonding the first substrate with the second substrate to from a liquid crystal cell; and
a step S 50 of irradiating the liquid crystal cell with UV light to form a first thin film on the surface of the first substrate and to form a second thin film on the surface of the second substrate, wherein a thickness of the first thin film is less than a thickness of the second thin film.

11. The method for manufacturing the LCD panel according to claim 10 , wherein the self-alignment liquid crystal material includes a vertical alignment agent, a polymerizable monomer, and a negative liquid crystal material.

12. The method for manufacturing the LCD panel according to claim 11 , wherein an amount of the vertical alignment agent is 0.1-5 wt % based on a total mass of the self-alignment liquid crystal material, an amount of the polymerizable monomer is 0.1-1 wt % based on the total mass of the self-alignment liquid crystal material, and an amount of the negative liquid crystal material is 94-99.8 wt % based on the total mass of the self-alignment liquid crystal material.

13. The method for manufacturing the LCD panel according to claim 12 , wherein the vertical alignment agent has a formula of:

wherein Q is an amine group, —OH, —COOH, or —SH;
A is a benzene group or a cycloalkyl group;
Sp is —(CH 2 )n- and n is a number of 1-8, wherein CH 2 can be replaced with —O—, —S—, —CO—, —CO—O—, —O—CO—, —O—CO—O—, —OCH2-, —CH2O—, —CH═CH—, —CF═CF—, —CH═CH—COO—, —OCO—CH═CH—, or —C≡C—;
R is a straight or branched chain C 3 -C 20 alkyl group, wherein CH 2 can be replaced with —O—, —CONH—, —COO—, —O—CO—, —CO—, or —CH═CH—, and H can be replaced with F or Cl;
P is a polymerizable group selected from at least one of a methyl methacrylate group, a methacrylate group, a vinyl group, a vinyloxy group, and an epoxy group; n is a number of the polymerizable groups which connect to a same aromatic ring and n is an integer of 1-3; and if n is greater than 1, the polymerizable groups can be same or different; and
X is a substituted group selected from at least one of —F, —Cl, —Br, a methyl group, —CN, and a straight or branched chain C 2 -C 8 alkyl group, wherein one or more methyl groups of the alkyl group which are not adjacent to each other can be replaced with O or S; m is a number of the substituted groups which connect to the same aromatic ring and m is an integer of 1-3; if m is greater than 1, the polymerizable groups can be same or different; and n+m is less than a number of groups to which the aromatic ring at most connect.

Assignees

• Shenzhen China Star Optoelect

Inventors

• Lan Song
• Chen Hsiaohsien

Classifications

• G02F1/133711 Primary

  by organic films, e.g. polymeric films · CPC title

• G02F1/137

  characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering · CPC title

• C09K19/542

  Macromolecular compounds · CPC title

• C09K19/56

  Aligning agents · CPC title

• G02F1/13 Primary

  based on liquid crystals, e.g. single liquid crystal display cells · CPC title